Telephone pay station



April 7, 1942. H; DHLE ETAL TELEPHONE PAYsTATIoN Fild sepi. 16, 1939v '6 'SheetsfSheet 1 //v VE/v roms April 7, 1'942. H. IDHLE ET AL TELEPHONE PAYSTATION Filed Sept. 16, 1959 5 Sheets-Sheet 5 54 HEINR/C'H LANG/VER ATTORNEY TELEPHONE PAYSTATION Filed sept. 1e, 1959 5 sheets-sheet '4 Byz' April 7, 1942.

H, D HLE ETAL TELEPHONE PAYSTATION Filed Sept. 16,

5 SheetsLSheet 5 /N VEN Tons;

ATTO/P/VEK Patented Apr. 7, 1942 TELEPHONE `BAY STATION Hinrich Dhle, Berlin-Altglienicke, Heinrich Langner, Berlin Steglitz,

and Wilhelm Schramm, Berlin, Germany, assignors to Telephon-Apparat-Fabrik E. Zwietusch & Co., G.. m. bfH., Berlin-Charlottenburg, Germany, a

company of Germany Application september 16, 1939, serial No. 295,200 In Germany September 23, 1938 (ci. 17e- 6.3)

7 claims.

Telephone paystations are'known in which the collection is effected electrically by a collecting impulse given at the end of the conversation and in vwhich the refund of the coins is initiated mechanically by the switchhook, the refund being"y either mechanically delayed or locked by 4a magnetcontrolled by theexchange mechanisms, until theA conversation is nished and the coins have been collected. The circuit arrangement ofthe telephone paystations ofthisv last-mentioned type is `of such nature that the connection of the locking magnet and of the collecting maghet to the line takes place only after the hangling-up of the receiver. Now, when the switchhook is very rapidly depressed and released again, it may happen that the locking magnet doesl not attract intime and' that the coin refund mechanism is released, beforethe collecting magnet had been permitted to attract.

It is the object of this present invention, to makesuch a fraud impossible and'to prevent the apparatus from being injuredby such a forced rapid up and'down movement of theswitchhook. According to the invention this object is obtained by'a switch rod loosely coupled with thev switchhook and. controlling a number of contacts.H "This switch rod is connected by a spring` fund released under the action of the tensioned,

spring. The switch rod actuated by the switchhook actuates a train of contacts over a momentary switch. This momentaryswitch is provided with a specially constructed switch member the guiding surfaces of which co-operate with stops of the switch rod in such a manner, that the changing over of the contacts takes place only in the end positions of the switch rod, in the upward as well as at the downward movement of the switch rod. Thisdoes away with all the possibilities of fraud existing where the switchhook contacts can be changed over in an intermediate position of the switchhook. The locking magnet actuates a stop by'which the displacement of the switch rod can be locked, so that the reversibility of the contacts which are controlled by the switch rod over the quick-acting switch becomes dependent'on the locking magnet, that is to say on the exchange equipment.

'I he hereafter described telephone -pay installation can be used for loca1,-trunk and automatic trunk traffic. The drawings, however, illustrate only those parts of the telephone paystations which are necessary for the understanding of the invention. The coin channels, the coin control mechanisms, and the collecting and refund channels are not shown, the drawings being limited to the mechanical elements of the apparatus which are controlled by the switchhook and by the collecting and locking magnets.

Fig. 1 is a front View of the apparatua'while the same is in its position of rest and the receiver is on the hook, f l

Fig. 2'is a side view of Fig. 1, y

Fig. 3 kis a front view, corresponding to Fig. 1, when the receiver is off the hook.

Fig. 4 shows the apparatus after the receiver has been'replaced and removed in rapid succession, s

Fig. 5 is a circuit diagram, showing part of the exchange equipment.

Asshown in Fig. 1 the switchhook 2 pivoted upon a pin I is provided at its free end with a pin 3 which bears against an angle 5 fixed to the switch rod 4. This rod is provided with two guideslots 6, 'I into which the pins 9, I0, attached to the wall 8, of the casing, extend. When the `switchhook is depresesd, the switch rod"4 is raised, and whenthe receiver is taken 01T, the switch rod descends under its own weight. The switch rod 4 is provided with two pins l I, I2, which engage alternately with the lever I3, if the rod 4 is raised and lowered. The lever I3 is pivoted upon a pin I4 mounted on they wall B of the casing and is connected at its one end with a spring I5 attached to the switch member I6. Switch member I6 is likewise pivoted upon pin I4 and acts upon the contacts HU by means of a cam I1. The switch member I6 is provided with two projections I8, I8 from the ends of which cam surfaces 20, 2l extend. These cams 20, 2l

` co-operate with the pins Il and I2 of the switch rod 4, so as to cause the rocking of the switch member I5 in the end positions of rod 4. When the receiver is taken'off and the switch hook is moved'from the position shown in Fig. 1 into the position shown in Fig. 3, the switch rod 4 descends, its stroke being determined by the slots 6, 1. On lthis downward movement the lever I3 is rocked byvv pin Il into the position shown in Fig. 3. In this position of lever I3 the spring l5 tends to pullthe switch member |6` into the position shown in Fig. 3. The rocking of the switch member can, however, only take place when the pin I2 has moved over the guiding surface 2|, so that this rocking is effected abruptly by the tensioned spring I1 and the contacts HU are instantaneously changed over with a large stroke. The lever I3 is further provided with a pin 22 by which the movement of the lever is limited. In the end positions of the lever I3 the pin 22 contacts with the extensions 23 and 24 of a member 25 rigidly mounted on pin I4, the extensions 26 and 21 of member 25 co-operating with a pin 28 carried by the switch member I6 in order to limit the movement thereof. By the quick-acting switch constituted by the members I3, I5, I6 in combination with the pins II and I2 of the switch rod the effect is obtained, that the contacts HU are only actuated in the end positions of the switch 4. In an intermediate position of the switchhook 2 no changing over of the contacts HU can be effected.

The switch rod 4 is connected by a spring 29 with a second rod 30 which controls the release of the refund mechanism, the said spring being attached to. a pin 3I of rod 4 and to a pin 32 of the tripping rod 3D. Pin 32 extends through a slot 33 of the switch rod 4. A lever 34 is pivotally supported upon a pin 35 carried by rod 39. The lever 34 is urged by a torsion spring 35 against the abutment 31 of rod 30 and is provided with a deflected nose 38 adapted to cooperate with an angular lever 39 pivoted upon a pin 4D. By the spring 4I the lever 39 is held in its intermediate position. When the receiver is taken o the switch rod 4 descends into the position shown in Fig. 3, the inclined nose 38 displacing the lever 39 against the action of spring 4I, so that the nose 38 passes below the abutment surface 44 of lever 3\9. On the ascent of the switch rod, caused by the replacement of the receiver, the rod 30 is likewise lifted upwardly by spring 29. On this movement the nose 38 of lever 34 causes the angular lever 39 to be rocked, until the surface 44 slides oi the nose 38. When the lever 39 is rotated, a pin 42 causes the tripping rod 43 to move in the direction of the arrow PI, Fig. 1, so that the bottom plate 45 of the coin receptacle 46 is moved into the` refund position. The pushrod 41 is moved in the direction of the arrow P2, when the collecting magnet KM is energised, so that the bottom plate 45 is rocked in the opposite direction and the coins contained in the container 46 drop into the coin receptacle.

The tripping rod 30 is provided With an extension 48 carrying a pin 49 which bears against the extension D of the armature 5I of the locking magnet SpM. The armature 5I is provided with an extension 52, by which the contacts spm are changed over when the armature is in its attracted condition. In the position of the armature 5I shown in Figs. 1 and 2 the armature comes into engagement with a pin 53 by which a lever 55 pivoted upon a pin 54 is held in the position shown in Fig. 2. The'lever 55 is acted upon by a torsion spring, not shown, which tends to move the lever 55 towards the switch rod 4. In the position shown in Fig. 3 the armature 5I has been attracted by the locking magnet SpM, so that vthe lever 55 bears against the projection 56 of rod 4.

As will be explained below with reference to the circuit diagram Fig. 5, the locking magnet taken oi. This is the operative position of the apparatus shown in Fig. 3. When the receiver is hung up and the rod 4 is thereby caused to rise, the following operations are carried through:

The magnet SpM at rst remains energised. By the attracted armature 5I the rod is held in the position Fig. 3 by pin 49 and by the extension of armature 5I. The spring 29 is therefore under tension when the rod 4 has reached the position shown in Fig. 1. As soon as the locking magnet SpM is de-energised, the armature 5I is raised by the tension of spring 29 and returned into the position shown in Fig. l. On this movement lever 39 is rocked, as explained, and the bottom plate 45 moved into its refund position.

When the receiver is hung up and taken off again within a very short interval, the locking magnet SpM remains energised so that the lever abuts against the extension 55 and prevents the switch rod 4 from descending completely. The switch rod therefore does not reach the end position shown in Fig. 3, so that the contacts HU remain in the position which they occupied, when the receiver was hung up. Only when the selectors in the exchange have been restored and the magnet SpM is de-energised, is lever 55 moved from its locking position, so that the rod is permitted to descend into its end position and to eiect a new seizure of the selectors by the changing over of contacts HU.

The reference numerals in Fig. 5 have the following meaning:

KM is the collecting magnet. The locking magnet SpM has a low resistance winding SpMI and a high resistance winding SpMII. The switchhook contacts are designated HU. Dr is a choke. In addition to the speech microphone MS a second microphone MK is provided :for the fee control by the operator by means of sound signals. The paystation telephone is to be operated with ten and fty pfennig pieces which at their passage from the coin inserting slot to the intermediate container 46 close the contacts gli) and `759 momentarily and drop against corresponding sound bodies. The impulses caused by the contacts gID and g5!! are used by a relay arrangement not shown in Fig. 5 for the autoy matic fee control on automatic trunk selection.

Of the dial the impulse transmitting contact is designated nsi and the OIT-normal contact designated usa. In case of an outgoing connection the preselector VW is started and a free group selector GW seized by the closing of the switchhook contact ZHU, in a manner wellknown. Between the contacts It and 2t of the T-relay (not shown) and the preselector VW, thev conductors are interchanged, so that on a connection coming from a final selector the reversed potential is applied to the lines leading to the telephone paystation. On an outgoing connection the metering relay, not shown, operates in known manner at the end of the conversation, and its contact a applies the collecting potential to the a-conductor. On an outgoing connection the locking magnet SpM is energised over the winding SpMI after the taking oi of the receiver, as the current in the line loop is of such a direction that the short-circuiting circuit which extends over the switchhook contact 4HU and the rectier G is without eiect. The operation of the contacts Ispm and 23pm has inoeffect during the speech condition, as the collecting ,magnet KM is disconnected by contact 3'I-IU and as the contact lspm is bridged by contact lI-IU. It is therefore possible to send out efficient money impulses by the contacts ql and Q50 prior to and after the lifting of the receiver. When the receiver is hung up, the contacts II-IU, 2HU, are changed over as explained. The locking magnet SpM is now held over the high resistance winding SpMII in the following circuit:

(l) Earth, 2spm, SpMII, 4HU, SpMI, It, A, battery.

In this circuit the control relay A in the group selector cannot hold so that the selectors are released. During the release operations in the exchange the contact z is changed over if a, conversation has taken place, so that the collecting magnet KM is energised over:

(2) Earth, 2spm, KM, 3HU, z, resistance, Wz'3, battery.

If an attempt is made to short-circuit the co1- lecting magnet KM by insertion of a coin during the sending out of the collecting impulses by contact z, this would be without effect as contact Ispm is still thrown over and contact ll-l'U is already opened. To act upon contact 3IIU is likewise impossible, as the magnet SpM is still energised and a changing over of the contacts HU is mechanically prevented, as explained.

On an incoming connection, for example a personal trunk call, the locking magnet SpM must be prevented from operating when the revceiver is removed. On a connection of this kind the calling operator asks the calling party to insert the necessary money. By the sound signals the o-perator controls the inserted amount and causes the calling party after having checked the amount inserted, to press a pay button, by the operation of which a collecting signal is released. In case of a difference of opinion between the operator and the calling party as to the total of the amount already inserted the calling party must be in a position to return the money at once and to insert it again. If in such a case the locking magnet would be energised, then the money refund takes place only when the locking magnet is de-energised. As the connection between the telephone pay station and the trunk exchange operator is to be maintained, the locking magnet would remain energised. By the use of a locking magnet responsive to the current direction which is different on incoming and outgoing traffic this diculty is removed.

We claim:

1. In a paystation telephone set, a switch hook, a reciprocatory member adapted to be moved between two extreme positions under control of said switch hook, contacts for controlling the circuit of said telephone set, said contacts at normal when said member is in one of said positions, means controlled by said member whenever moved from said one position to the other of said positions for operating said contacts responsive to said member reaching said other position and controlled by said member whenever moved from said other position to said one position for restoring said contacts to normal responsive to said member reaching said one position, and means controlled by said member for locking said member in said one position for an interval of time after it has been moved to said one position from said other position.

2. In a paystation telephone set, a switch hook, a reciprocatory member adapted to be moved between two extreme positions under control of said switch hook, contacts for controlling the circuit of said telephone set, said contacts at normal when said member 'is in one of said positions, means controlled by said member whenever moved from said one position to the other of said positions for operating said contacts thereby to initiate the extension of a connection from said paystation, said means controlled by said member when subsequently moved from said other position to said one position for restoring said contacts to normal thereby to initiate release of said connection, locking means controlled over the connection after said member has been moved to said one position from said other position to prevent said'member from being returned the full distance to said other position for an interval of time, and means for preventing operation of said contacts by said member when same occupies said one position or any position intermediate said one position and said other position.

3. In a paystation telephone set as claimed in claim 2, a collect magnet for controlling the collection of coins, and a circuit for said magnet prepared conjointly by said locking means and said reciprocatory member during said interval of time.

4. In a paystation telephone set, means for refunding coins, a switch hook, a reciprocatory member adapted to be moved between two extreme positions by said switch hook, means controlled by said member when it is moved from one of said positions to the other thereof and returned to said one position for conditioning said refunding means f-or operation, means for delaying the completion of the refunding operation for an interval, means controlled by said last means for preventing said member from being moved from said one position to said other position during said delay in the refunding operation, switchover contacts for controlling the circuit of said telephone set, said contacts at normal when said reciprocatory member occupies said one position, means controlled by said member whenever moved from said one position to said other position for operating said contacts responsive to said member reaching said other position and controlled by said member whenever moved from said other position to said one position for restoring said contacts to normal responsive to said member reaching said one position.

5. In a paystation telephone set, two members coupled by a spring, each of said members occupying a normal position, a switch hook operable in one way to initiate calls and operable in another way to terminate calls, means controlled by an operation of said switch hook in said one way for moving said members and said spring substantially as a unit away from normal, said means controlled by a subsequent operation of said switch hook in said other way for restoring one of said members to normal, an electromagnet operated responsive to said rst operation of said switch hook and maintained operated for an interval after said subsequent operation thereof, means controlled by said electromagnet for preventing the other of said members from restoring to normal while the electromagnet remains operated, whereby said other member cannot return to normal until an interval has elapsed after the return of said one member to normal, said spring effective to restore said other member to normal responsive to the release of said electromagnet,v a coin refundingmechanism, and means controlled by the return of said other member to normal for operating said mechanism.

6. In a paystation telephone set, tWo members coupled by a spring, each of said members occupying a normal position, a switch hook operable in one way to initiate calls and operable in another Way to terminate calls, means controlled by an operation of said switch hook in said one Way for moving said members and said spring substantially as a unit away from normal, said means controlled by a subsequent operation of said switch hook in said other Way for restoring one of said members to normal, an electromagnet operated responsive to said rst operation of said switch hook and maintained operated for an interval after said subsequentoperation thereof, means controlled by said electromagnet and effective after said one member has been returned to normal for preventing said one member from being again moved away from normal While said electromagnet remains operated, other means controlled by said electromagnet for preventing the other of said members from restoring to normal While the electromagnet remains operated, whereby said other member cannot return to normal until an interval has elapsed after the return of said one member to normal, said spring elective to restore said other member to normal responsive to the release of said electromagnet, a coin refunding mechanism, and means controlled by the return of said other member to normal for operating said mechanism.

'7. In a paystation telephone set as claimed in claim 6, a contact set for controlling the circuit of said telephone set, said Contact set at normal when said one member is at normal, means controlled by said one member Whenever said one member is moved away from normal for operating said Contact set responsive to said one member arriving at a point a predetermined distance away from its normal position and controlled by said one member whenever said one member is restored to normal for restoring said Contact set to normal responsive to said one member arriving at its normal position.

HINRICH DHLE. HEINRICH LANGNER. WILHELM SCHRAMM. 

